To all whom it may concern



@uitrit tates gatritt @ffice WILLIAM H. CAPEWELL, OF WES'IVILLE, NEW JERSEY.

Letters .Patent No. 71,578, dated December 3, 1867'.

IMPROVED lGIASS-lll[AKEItS POT.

TO ALL WHOM IT MAY CONGERN:

Be it known that I, WILLIAM CAPnwnLn, of Westville, in the county of Gloucester, and State of New Jersey, have invented a new and improved Glass-Makers Pot; and I do hereby declare that the following is a full, clear, and exact description of the 'same,reference being had to the accompanying drawing, andvto the letters of reference marked thereon. Y

My invention relatesv to a cup or shield which surrounds the waist and bottom of a glass-makers pot, to increase its durability; and in the event'oi the pot crackingwhile in the furnace, the glass contained in it will be caughtin the said cup, substantially as' ischereinafter shown. On reference to the accompanying drawing, which forms a part of this specification--` -Figure 1 is a. sectional view, and

Figure 2 is a plan view.

Similar letters refer to similar parts inthe two views.

No branch of glass-manufacture requires greater care than the construction of melting-pots.- They must be made of the most infusible clays', and be kept for a long while in pot-arches before introducing them into the melting-oven. In order gradually to prepare them to beer the high temperature of the oven, andrender'them stronger, they are introduced only after having'lbeen subjected to a'very high temperature. After the pots are set in the oven, the attendant deposits the frit "or material in them. After the addition of each shovelful he waits until the material is melted before adding another, and so-on, until the pot is filled; (in some instances the pots are filled'a-t'one charging.) When the glass is suiiciently fused, the temperature ofthe furnace is lowered, in order to bring the glass to a consistency fit for working. Each pot should serve several mel-tinge, but such is not the case. The repeated op'enngof the oven to deposit the material in the pots, and observe its condition, removing clinkers from the tires, tends to make the temperature of the oven variable, and causes thc pots to contract and expand suddenly, thereby cracking them, and causing the glass to run to waste. (Some glass-makers assert that the breakage cf pots is caused by the clays of which they are made not being homogeneons.) Y i Y To prevent the pots from breaking or cracking,-I surround the waist a and bottom of eachpotA with a cup or shield, B, the waist of the pot taking into the cup, its bottom resting on the bottom of thecup. To prevent their surfaces from becoming fixed, a space, b, intervenes. The cup B, surrounding the waist a, the part' where the heat is greatest, prevents the sudden gusts of cold air into the furnace from altering the temperature ofthe pot. In case a pot should crack and fall to pieces, the molten glass will be caught in the cup, in. which the fusion can be carried on until it beconvenient to draw the ires 'and remove it. l'

The cup B is shown cylindrical, conforming with4 the configuration of the waist, out I wish it distinctly understood that I do not confine myself to any particular form.

What I claim as my invention, and desire to secure by Letters Patent, is

Enclsing the waist a and bottom of the pot, A, within a cup, B, when constructed and arranged as and for the purpose herein specified and described. I -V In testimony whereof, Ihereunto sign my name to this specification in presence of two subscribingwituesses.

WILLIAM HL GAPEWELL.

Witnesses:

FnA'Ncrs D. Pss'rosics,

W. W. Donern'tnrr.A 

